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AP®︎/College Biology

Course: AP®︎/College Biology > Unit 4

Lesson 2: Signal transduction

Signal transduction

AP.BIO: IST‑3 (EU), IST‑3.C (LO), IST‑3.C.1 (EK), IST‑3.C.2 (EK), IST‑3.D (LO), IST‑3.D.1 (EK), IST‑3.D.2 (EK), IST‑3.E (LO), IST‑3.E.1 (EK)

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Acetylcholine is a neurotransmitter that helps control muscle contraction. This neurotransmitter functions differently depending on which type of muscle it interacts with. For example, acetylcholine promotes muscle contraction in skeletal muscle but inhibits contraction in heart muscle.

Which of the following best explains why acetylcholine leads to different cellular responses in skeletal and heart muscle?

(Choice A)
Acetylcholine binds with less affinity to receptors in heart muscle than in skeletal muscle.
(Choice B)
Acetylcholine binds to more receptors in skeletal muscle than in heart muscle.
(Choice C)
Acetylcholine binds to different types of receptors in skeletal and heart muscle.
(Choice D)
Acetylcholine binds more tightly to receptors in skeletal muscle than in heart muscle.

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AP®︎/College Biology

Course: AP®︎/College Biology > Unit 4

Problem